Power driven brush



Oct. 1, 1963 R. F. TILGNER POWER DRIVEN BRUSH 2 Sheets-Sheet 1 Filed Feb. 9 1961 FIG.6

FIG.5

INVENTOR.

Oct. 1, 1963 I R. F. TILGNER 3,105,261

POWER DRIVEN BRUSH Filed Feb. 9, 1961 2 Sheets-Sheet 2 INVENTOR. EfllP/l E T/LG/V'k A TfOk/VEY 3,195,251 P? nil DRE/EN BRUSH Ralph F. Tilguer, Ellicott City, Md, asslgnor to Eittshurgh Piste Glass Company, Pittshurgh, Fa a corporation of Pennsylvania Filed Feb. 9, 1961, Ser. No. 83,193 11 Claims. ((35. -139) This invention relates to a power driven cup brush comprising an outer cup and one or more plates constituting brush rings disposed within the cup, and having tufts of fill material disposed in perforations around the ring and/ or rings. The invention has particular relation to the provision of strong and simple means providing a positive drive from a shaft or arbor to the cup, and it further has particular relation to strong and simple means providing at once a drive between the cup and brush rings, and also positively holding the several elements of the brush in assembled relationship.

It has heretofore been disclosed to form so-called cup brushes comprising an outer cup and one or more brush rings disposed within the cup, and having tufts of doubled fill material, such as spring wire, inserted in and twisted in perforations around the perimeter of the rings. In order to provide means for securing the brush upon a shaft or arbor and for providing a drive between the latter and the cup, it has been disclosed to provide a tubular bushing within an axial hole formed through the bottom of the cup and the brush rings. In some instances, the bushing has been formed integrally at one end with the bottom of the cup, and at the other end has been flanged over to prevent displacement of the brush rings from the bushing. This type of construction is illustrated in the patent to Nelson, 2,789,303.

Another type of construction is illustrated in the patent to Wilhide, 2,534,891, wherein a plurality of brush rings having tufts of fill material about the perirneters thereof are disposed within a cup, and the bottom of the cup and the brush rings are again axially perforated to receive a central bushing which is threaded for purposes of securing it upon a shaft. The assembly is locked together by flanges upon the bushing, one engaging the bottom of the cup and the other engaging the face of a ring to hold the assembly together. Both of these constructions are objectionable, inasmuch as there is no positive drive from the cup to the rings.

Obviously, friction constitutes an unreliable driving connection, especially for large size brushes such as are used in doing heavy work. Rotation between the cup and the brush rings can result in wear and also in excessive heating of the construction.

This invention comprises the provision of positive driving means between a brush cup and the shaft upon which it is mounted, and further comprises the provision of a positive drive bet-ween the cup and the brush rings. As one feature, the invention as herein disclosed comprises the formation of noncircular axial perforations in the plate-like bottom of the cup or in other annular plates of the brush, e.g., the brush rings disposed within the cup, and the provision of a nut fitting within the noncircular perforations and being threaded upon the end of an arbor so as to give a positive drive between the perforate element of the assembly and the shaft. As a further feature, the invention comprises the provision of mating perforations extending through the brush rings and the cup, and having appropriate-studs secured therein so that there is a positive drive between the cup and the brush rings. The brush rings are adapted simultaneously to hold the several elements of the brush in assembled relationship and also to prevent any rotary movement between the cup element and the brush rings regardless of the load imposed upon the construction in operation.

-'-l ii For a better understanding of the invention, reference may now be had to the accompanying drawings, in which:

FIGURE 1 is a View partially in elevation and partially in section of one embodiment of the invention.

FIGURE 2 is a view also in partial section of a slight modification of the construction.

FIGURE 3 is a corresponding view in partial section of a still further embodiment of the invention.

FIGURE 4 is also a partial sectional view of a still further embodiment of the invention.

FIGURE 5 is a fragmentary sectional view illustrating a slightly modified cup structure having means for holding or rotating the same during application of the brush to, or removal of a brush from, a mandrel or arbor.

FIGURE 6 is an isometric detailed view of an appropriate nut structure for use in securing the brush assembly to a mandrel.

FIGURE 7 is a detailed view in plan of a cup element for the brush.

FIGURE 8 is a fragmentary view of a brush ring suitable for holding twisted tufts of fill material.

In the construction as shown in FIGURE 1, an annular plate-like bottom element 7 having radial corrugations 8 is provided with a peripheral wall 9, thus forming a cup it. Plate 7, constituting the bottom of the cup, is provided with an axial opening 11. This opening is formed to fit a nut 12 of polygonal section. The nut may, for example, be a well-known rectangular nut, hexagonal nut or octagonal nut, and the opening 11 will be shaped to fit with reasonable accuracy the sides of the nut, thus providing for positive rotation of the cup when the nut is rotated. The nut at its lower face is also provided with a flange :13 which may be integral therewith, or may be welded or otherwise secured upon the nut. This flange is disposed upon a spacer plate 14 having a central opening corresponding to the opening =11 and functions positively to hold the spacer plate in the cup. It will be observed that a threaded end portion 16 of a power driven mandrel or arbor 17 extends through the nut 12. and the nut is jammed against a shoulder 17a of the arbor, and thus provides a positive drive for the nut. Needless to say, the threads of the nut and the portion 16 are so formed that when the brush is driven, the nut tends to travel upon the shaft, thus assuring against accidental displacement thereof.

In the embodiment of the invention shown in FIGURE 1, two annular plate elements constituting brush plates or rings 13 and 19 are provided. Ring 19 is formed with a flange about its perimeter as indicated at 21 to give an inner cup effect. Each brush ring has a series of openings 21a formed about the perimeter thereof and turfs of fill material 22, for example, of steel or brass wire or other appropriate material, are inserted in the openings. The tufts are doubled and, as shown in the drawings, the doubled ends are twisted together whereby to prevent displacement thereof during the operation of the brush. The tufts are held in approximately parallel or at least non-radial relationship with respect to the axis of the arbor by Wall 9. Each of the rings 18 and 1? is provided with a central opening which may be round and is of a size to permit the threaded portion 16 of the shaft 17 to clear.

Means to hold the brush elements in assembled relationship may comprise rivets or bolts. In the construction shown, two or more so-called Huck bolts 23 are employed. These are of conventional design and include a head portion 24, a stem portion 26 and a series of peripherally extending grooves 27. The latter are to be distinguished from conventional threads, inasmuch as each one extends as a complete perpiheral channel or grooves on the stem 26 independently of contiguous grooves on the stem. Means to hold the bolts in openares-,aer

ings in the bottom of the cup and the several plates or rings 14, 18 and 19 is illustrated as comprising swage collars 31 usuallyformed of rather soft metal, such as aluminum, soft iron, or the like. These fit over the ends of the bolts and are roughly truncated cones. For purposes of locking the nuts upon the bolts, they are subjected to pressure directed more or less radially inwardly, thus forcing metal to flow into the grooves 27 about the bolts and positively preventing displacement of the nuts from the bolts. It will be observed that in this construction, the possibility of the swage collars 31 unscrewing from the stems 26 is obviated.

One feature of this construction, shown in FIGURE 1, resides in the fact that the upwardly projecting swage collars 31 constitute spaced heads between which a tool may be applied for rotating the brush assembly in order to unscrew it from the threaded portion of the arbor or shaft. It will be manifest that any appropriate number of brush rings may be employed in the cup. The two shown are merely by way of illustration. The Huck bolts and swage collars may be replaced by conventional spirally threaded bolts and nuts. Also, the unheaded portions of a bolt may be battered over to prevent displacement of the bolt, thus eliminating both swage collars and threaded nuts.

The flange 13 is clamped against the margins of the opening in plate 14 by means of plate 18.

it will also be apparent that in the construction shown, the nut 12 provides a positive drive from the arbor or shaft 17 to the cup it and that the bolts 23 provide a positive drive between the cup and the brush rings. Additionally, they function to hold the entire assembly together.

If preferred, the bolts 23, instead of each extending continuously entirely through the cup and the several rings and plates, may be of shorter length and some thereof may extend in one direction while the remaining ones extend in the opposite. For example, the flange 13 of the nut 12 may have holes 13a and 131) formed therein. These holes may have countersunk portions for reception of conical heads of such bolts. The bolts may be matched with corresponding holes in the bottomof the cup 1%, the plate 14 and the plates 18 and 19. Through the flange 13, all parts are held together. The two types of bolts (short and long) may be used alternatively or concurrently.

The construction as illustrated in FIGURE 2 is a modification upon that shown in FIGURE 1 and includes a cup 35 which may be the same as or similar to that 7 shown in FIGURE 1, except that the axial opening in the bottom thereof may be circular. The construction is illustrated as having but one brush ring 36, though it will be apparent that additional brush rings may be supplied if desired. A spacer plate 37 may be provided within the cup and is engaged by a flange 38 corresponding to the flange l3, and being upon a nut 39 corresponding to the nut 1 In this instance, the nut is directed through a closely fitting polygonal opening in the annular platelike brush ring 36, thus to provide a positive drive between the ring and a threaded end 41 of a shaft or arbor 42. The axial openings in the bottom of the cup 35 and the spacer plate 37 are circular and fit closely around the threaded end 41. Huck bolts 43, corresponding to those already described, are used to hold the several plates and the cup in assembled relationship. However, in this construction, the swage collars 44 are directed downwardly in the same direction as the nut 35. This provides for a minimum of projections upon the exterior of the cup, which is sometimes desirable. in this construction, it will be observed that the radial corrugations on the annular plate-like bottom of the cup is jammed against a shoulder portion 46 of the shaft 42..

The hexagonal nut 12, having the flange 13 as indicated in isometric view in FEGURE 6, may be used with the constructions as shown in either FIGURE 1 or 2 to secure the brushes on the threaded shaft.

In the construction, as shown in FIGURE 3, the cup 59 may corresponding to the cup 35 of FIGURE 2, and the annular plate-like brush plates or rings 51 and 52 may also correspond to those elements, as illustrated in FIGURE 1. The perimeters of the brush rings are perforated to receive bristle tufts. The brush ring, as illustrated in this figure, is clamped by a lower or clamping plate 53, and the assembly is positively held together again by Huck bolts 54 having collars 56 disposed within the cup. In this construction, the plate 53 is formed with a central opening 5'7 which is of appropriate noncircular section, e.g., hexagonal, to receive a plain unflanged nut which is threaded upon the end portion 59 of shaft 61 so that a positive drive is provided between the shaft and the plate 53. From the plate 53 through the bolts 54, a positive drive to the cup 59 is afforded by bolts 54. An advantage of this construction is that a plain unfianged nut can be used to secure the brush to the arbor. For shippin purposes, the nut 58 may be cemented in place in opening 57. This is suificient to hold it in the socket formed by opening 57 before the brush is mounted upon a shaft 61.

In the construction, as illustrated in FIGURE 4, the cup 65 again is the same as the cup 19 shown in FIG- URE l. The cup is provided with a pair of spacer plates 66 which rest upon the bottom of the cup and are formed with noncircular openings 67 registering with a noncircular opening in the bottom of the cup. The openings provide a driving socket for a nut '68 upon the end 69 of a shaft 71. The lower face of the nut 63 engages with a brush plate 72 which has a circular opening through which the end 69 of the shaft 71 extends. The assembly is held together again by Huck bolts 73 having swage collars 7 disposed within the cup. The bolts 73 constitute means positively holding the cup and the plate 72 together to rotate as a unit. In this construction, the cup is further looked upon the end 69 of the shaft 71 by means of a nut 76. Both of the nuts 63 and 76 may,

if desired, be plain; that is, formed without flanges, thus reducing the cost of the construction somewhat. The diameter of the opening in plate 72 is less than that of the opening 67, thus providing a shoulder which is clamped between the nuts.

As shown in FIGURE 5, one or more radial ridges, e.g., corrugations or ridges 8, on the bottoms of the cups that serve to give rigidity may be perforated as at 78 in order .to permit the insertion of the end of a screwdriver 79 or other instrumentality whereby the cup may be held or rotated during the application thereof to, or removal from, a shaft.

It will be apparent that the constructions as shown are very simple and costs of manufacture thereof are reduced to a minimum. At the same time, great rigidity is provided, especially with respect to the drive between the shaft and the cup, or between the cup and the brush rings.

The cups and/or brush rings, plates, etc. of the foregoing embodiments of the invention may be formed of iron, steel, brass, or of lighter materials, such as aluminum, or of plastic (e.g., an interpolymer of a vinylic monomer and an alpha-beta ethylenic dicarboxylic acid, as disclosed in f'arker Patent 2,593,787). Preferably, the plastic, if used, is reinforced as with a cloth of glass fibers or with mats or bats of glass fibers.

The embodiments of the invention as "shown and described are to be considered as being by way of illustration. Numerous modifications may be made therein without departure from the spirit of the invention or the scope of the appended claims.

I claim:

1. A cup brush comprising an outer cup element, said cup element having a side wall and a bottom wall, a noncircular opening formed coaxial-1y in the bottom wall and a noncircular nut fitting closely within the opening and being adapted to be threaded upon an end of a driving arbor, said nut providing a driving connection between the arbor and the cup element, said nut having a radial flange within the cup element preventing axial movement thereof in one axial direction from the opening, a brush plate disposed within the cup element and engaging the flange :on the nut to hold the same from axial displacement in the other axial direction, and having perforations formed about the outer perimeter thereof and tufts of fill material disposed within the perforations, the tufts being held in nonradial position by the side Walls of the cup element, added perforations formed in the brush plate and registering with perforations formed about the noncircular opening in the bottom Wall of the cup element, and bolt means extending through the latter perforations in the brush plate and the perforations in the bottom of the cup element to hold the assembly together.

2. A brush construction comprising an outer cup element having a peripheral wall, a brush plate disposed within the cup element and having openings formed about the perimeter thereof, tufts of fill material disposed in the openings, a series of bolt elements extending through added openings in the bottom of the cup element and the brush plate, and positively locking them together from relative rotation, said brush plate having a noncircular coaxially disposed opening formed therein and a noncircular nut of approximately the same cross-sectional dimensions as the noncircular opening disposed in said noncircular opening, the nut having a radial flange clamped between the brush plate and the bottom of the cup element to prevent displacement of the nut, said nut being adapted to be threaded upon the end of an arbor and providing a positive drive between the brush and the arbor.

3. A cup brush comprising a plurality of circular plate elements stacked in coaxial relationship with respect to each other, the outermost of said plate elements having a flange about the perimeter thereof providing the side wall of a cup enclosing the other plate elements, at least one of the plate elements having a noncircular axial opening formed therein, a nut adapted to be threaded upon a driving arbor and being of corresponding nonoircular section disposed in the opening, said nut having a radial flange formed at one face thereof, said radial flange being clamped between a pair of the plate elements to prevent displacement of the nut from the opening, one of the plate elements within the cup having openings formed about the perimeter thereof and having tufts of fill material secured therein.

4. The cup brush as defined in claim 3 wherein the noncircular opening is in the outermost plate element and the nut projects outwardly from the cup.

5. The cup brush as defined in claim 3 wherein the several plates me held in assembled relationship by a plurality of bolts inserted in matching holes formed in the plate elements.

6. The cup brush as defined in claim 4 wherein the stacked plate elements are held together in assembled relationship by a plurality of bolts radially spaced from the axis of the brush.

7 The construction as defined in claim 6 wherein the axial opening is formed in the innermost plate element and the nut projects through same into the cup.

8. The cup brush as defined in claim 3 wherein the outermost plate element is formed with radial corrugations, and an opening formed through the corrugations for the insertion of a pointed instrument for holding the brush for relative rotation with respect to a shaft,

' 9. In a cup brush, a cup having a side wall and a bottom plate, an axial opening formed in the plate and being adapted to receive a threaded end of a driving arbor, a spacer plate disposed within the cup and engaging the bottom plate and having an opening coaxial ly disposed with respect to the opening in the bottom plate, a brush plate disposed upon the spacer plate and having a central opening formed in coaxial alignment with the openings in the bottom plate and the spacer plate, said brush plate further having openings formed about the perimeter thereof, the latter openings having tufts of fill material disposed therein and en aging the side walls of the cup, a clamping plate disposed upon the brush plate and having a noncircular opening formed therein in coaxial alignment with the openings in the bottom plate and the spacer plate and receiving a nut threaded upon the end of 'an arbor extending through the openings in the bottom plate and the brush plate, said nut being of transverse shape and dimensions substantially to fill the noncircular opening whereby to clamp the brush plate against the spacer plate and to retain the brush from rotation upon said arbor, and means securing the bottom plate and the remaining plates together to rotate as a unit.

10. A cup brush comprising a plurality of circular plate elements stacked in coaxial relationship with respect to each other, the outermost of said plate elements having a flange about the perimeter thereof providing the side wall of a cup containing the other plate elements, reinforcing means for imparting rigidity to said outermost plate element of said cup, at least one of the plate elements having a noncircular axial opening formed therein, a nut adapted to be threaded upon a dniving 'arbor and being of corresponding noncircular section disposed in the opening;

said nut having a nadial flange formed about the perimeter thereof, said radial flange being clamped between a pair of plate elements to prevent displacement of the nut from the opening, one Of the plate elements within the cup having openings formed about the perimeter thereof and having tufts of fill material secured therein.

11. A cup brush comprising a plurality of stacked plates, one plate being a bottom plate having a peripheral flange constituting a Wall of a cup, a brush plate disposed within the cup and being formed with perforations disposed near the edge thereof and having tufts of fill material disposed therein, and a spacer plate disposed between the bottom plate and the brush plate, bolt means positively securing all of the plates together from relative rotation with respect to each other, said plates further having coaxially disposed openings formed therein to receive a threaded end of a driving arbor, the opening through the bottom plate and the spacer plate being noncircular and providing a driving socket for a nut threada ble upon the arbor, said nut being of substantially the same transverse size and shape as the noncircular opening whereby to provide a driving connection between the brush and the arbor, the diameter of the coaxial opening in the brush plate being less than the face of the nut, a second nut threadable upon a driving arbor and consituting means clamping said shoulder against the face of the first-mentioned nut whereby to prevent displacement of the brush from the arbor.

References Qited in the file of this patent UNITED STATES PATENTS 938,089 Svoboda et al Oct. 26, 1909 1,39l,882 Dwornic Sept. 27, 1921 1,461,615 Hermanowioh July 10, 1923 1,998,562 Sturgis Apr. 23, 1935 2,062,047 Bickel et al Nov. 24, 1936 2,504,643 Burgoon Apr. 18, 1950 v FOREIGN PATENTS 7 1,234,012 France May 9, 1960 

10. A CUP BRUSH COMPRISING A PLURALITY OF CIRCULAR PLATE ELEMENTS STACKED IN COAXIAL RELATIONSHIP WITH RESPECT TO EACH OTHER, THE OUTERMOST OF SAID PLATE ELEMENTS HAVING A FLANGE ABOUT THE PERIMETER THEREOF PROVIDING THE SIDE WALL OF A CUP CONTAINING THE OTHER PLATE ELEMENTS, REINFORCING MEANS FOR IMPARTING RIGIDITY TO SAID OUTERMOST PLATE ELEMENT OF SAID CUP, AT LEAST ONE OF THE PLATE ELEMENTS HAVING A NONCIRCULAR AXIAL OPENING FORMED THEREIN, A NUT ADAPTED TO BE THREADED UPON A DRIVING ARBOR AND BEING OF CORRESPONDING NONCIRCULAR SECTION DISPOSED IN THE OPENING, 